徐家围子断陷CO2气成藏与分布的主控因素及有利区预测

在分析徐家围子断陷CO2气藏形成条件与分布特征的基础上，指出深大断裂、火山岩储集特性、岩浆性质和盖层是该断陷CO2气藏形成与分布的主控因素。深大断裂的活动与分布控制着CO2气藏的形成与分布；火山岩储集物性优劣控制着CO2气藏的形式；岩浆性质决定着CO2气藏的丰富程度；盖层质量好坏控制着CO2气藏的保存程度。CO2气是岩浆冷凝析出，并在由裂缝勾通孔洞的火山岩体中聚集成藏。汪家屯、升平和昌德地区是该断陷CO2气下一步勘探的有利地区。

Main Factors Controlling the Formation and Distribution of Carbon Dioxide Gas Reservoirs and Favorable Areas Prospecting in Xujiaweizi Depression

Based on the analysis of the formation conditions and distribution characteristics of carbon dioxide gas reservoirs in Xujiaweizi depression, it is pointed out that the quality of magma, the reservoir quality of volcanic rock, deep big faults and caprock are the main factors controlling the formation and distribution of carbon dioxide gas reservoirs. The activity and distribution of deep big faults controlles the formation and distribution of carbon dioxide gas reservoirs, The reservoirs' quality of volcanic rock controlles the formation of carbon dioxide gas reservoirs. The quality of magma controlles the accumulation degree of carbon dioxide gas, The quality of caprock controlles the preservation degree of carbon dioxide gas. The carbon dioxide gas released from the cools of magma accumulated in the pores or holes connecthed by fracture in volcanic rock. Wangjiatun, Shengping and Changde are the favorable areas for carbon dioxide gas to accumulate and form carbon dioxide gas reservoirs.